Six verses coupled with colorful collages hint at the identities of different creatures born from eggs: a penguin, an alligator, a duckling, a sea turtle, a spider, and an octopus. In each case, the rhymed riddle ends with the question: "Guess what is growing inside this egg?" The spread that follows each one gives the answer with a brief description of the animal, what it does after hatching, and its diet. A final section compares the sizes of the eggs, incubation periods, and provides a more in-depth look at the development of a duckling in the egg. On the query pages, charming illustrations-watercolors combined with collages-depict the eggs' habitats and a portion of the adult animals, while the answer pages feature the newly born creatures and a more revealing portrait of the adults. The details in Posada's paragraphs will appeal to youngsters, and the occasionally clumsy interrogative verses create swift "hooks" for parents and teachers reading the book aloud. This attractive introduction to the gestation and life of young animals is recommended for both libraries and bookstores.-Coop Renner, formerly from El Paso Independent School District, TXCopyright © Reed Business Information, a division of Reed Elsevier Inc. All rights reserved.